audio.js

hunt.audio = (function(){
	var dom = hunt.dom,
		extension,
		sounds,
		activeSounds;

	function initialise() {
		extension = formatTest();
		if (!extension) {
			return;
		}
		sounds = {};
		activeSounds = [];
	}


	function createAudio(name) {
		var el = new Audio("sound/" + name + "." + extension);
		dom.bind(el, "ended", cleanActive);
		
		sounds[name] = sounds[name] || [];

		sounds[name].push(el);
		return el;
	}

	function cleanActive() {
		for (var i=0;i<activeSounds.length;i++) {
			if (activeSounds[i].ended) {
				activeSounds.splice(i,1);
			}
		}
	}

	function getAudioElement(name) {
		if (sounds[name]) {
			for (var i=0,n=sounds[name].length;i<n;i++) {
				if (sounds[name][i].ended) {
					return sounds[name][i];
				}
			}
		}
		return createAudio(name);
	}


	function formatTest() {
		var exts = ["ogg", "mp3"],
			i;
		for (i=0;i<exts.length;i++) {
			if (Modernizr.audio[exts[i]] == "probably") {
				return exts[i];
			}
		}
		for (i=0;i<exts.length;i++) {
			if (Modernizr.audio[exts[i]] == "maybe") {
				return exts[i];
			}
		}
	}
	
	function play(name) {
		var audio = getAudioElement(name);
		audio.play();
		activeSounds.push(audio);
	}

	function stop() {
		for (var i=activeSounds.length-1;i>=0;i--) {
			activeSounds[i].stop();
		}
		activeSounds = [];
	}

	return {
		initialise: initialise,
		play: play,
		stop: stop
	};
})();